Setts



(No Model.)

PzUNTzf `PLUsH TANK.

No. 373,885. Patented Nov. 29, 1887.

UNITED STATES PATENT OFFICE.

FRIEDRIOH OUNTZ, OF OARLSBAD, BOHEMI'A, AUSTRIA-HUN GARY, ASSIGNR v TO. THE DRAINAGE OONSTRUCTION COMPANY, OF BOSTON, MASSACHU- SETTS.

FLUSH-TANK.

SPECIPICATION forming part of Letters Patent No. 373,885, datecl November 29, 1887.

Application filed February 14, 1887. Serial No. 227.646. (No modelJ Patetted in England March 22, 1884, No. 8,091; in

GermanyJnly 14, 1884, No. 27,959, and in Austria-Hungary December 6, 1884, No. '2,471 and No. 2,428.

Z'o aZZ whom it may concern:

Be it known that I, FRIEDRIOH OUNTZ, of Oarlsbad, Bohemia, Austria-Hungary, havein'- vented anew and useful Improvementin Flush- Tanks, (for which patents have been taken out in'England, No. 8,091, ot' March 22, 1884; in Germany, No. 27,959, of July 14, 1884, and in Austria-Hu ngary, No. 2,471 and No. 2,428, December 6, 1884;) and I hereby declare that the 1o following is a full, clear, and exact description of the same, reference'being had to the drawings, forming part of this specification.

My invention relates to Van improvement in flnsh-tanks for flushing sewers.

The apparatns consists of a reservoir or tank fed by a continuous'small stream from the water-supply,which is rapidly emptied by an au- 'tomatic siphon when the water-level in the tank reaches a certain height.

2oV The discharging apparatus consists of asiphon brought into action when the tank is full to or nearly to the overflow-point by the rarefaction of its contained air, the rarefaction being effected by an air-pump or aspirator z 5 worked by the entering stream of water. The air-pump most conveniently used works on the principle of the jet-pump or injector.

The better to illustrate my invention, reference is made to the accompanying drawing,

3o in which the form of siphon illustrated is the annular siphon. The same principle may be applied to a bent siphon. i

ais the discharging-limb, and a' is its receiving-limb. The water is delivered from the water-supply throughv the pipe, Which, after entering the tank, may or may not have a stop-cock, d, for the more rapid filling of the tank. In the course of the pipe there is placed a jet-pump or other similar apparatus, as

4o shown at b. In the arrangement shown the water escaping through the nozzle at the end of the pipe f,which isinclosed within the pumpchamber, is driven into the eXhaust-pipe g and escapes into the tank. The suction-pipe of the air-pump opens into the upper part of the siphon. The water passing from the nozzle into the exhaust-pipe carries air withit. This air is replaced by air drawn from the interior of the siphon. After the water in the tank V5o has risen to close the mouth of the receivinglimb a', then, the discharging limb being trapped, as shown at e, the air in the siphon is cut off from the air of the tank.

In my invention communication is established between the air in the tank and the air in the siphon by the pipe c, so placed that until the tank is filled to or nearly to the overflow-point it remains open, one of its ends becoming closed by sealing when the water rises a little higher. 6o

Having described my invention with reference to the drawing, I now describe its mode of operation. The tank being partly filled, as shown, and water fiowing into it through the pipefand delivered by its nozzle into the exhaust-pipe g/ of the airlpump b, air is withdrawn from the siphon, being replaced by the air of the tank passin'g through the pipe c. As the tank fills, its water will rise until it seais one end of the pipe c, thus cutting off 7o the supply of air to the siphon. From this moment the further withdrawal of air from the siphon tends to its rarefaction and causes it to fill with Water until its siphonic action takes place. The tank having been emptied down to the mouth of the' receiVing-limb a, and air being there ad mitted, the siphonic action ceases. The water still retained in the-siphon, partly fi1lingit,`is allowed to escape slowly by the admission of air through the pipe c, which is 8o again open from the tank to the siphon. The pipe c is a very small one, and the amount of air admitted through it during the operation of the siphon is not sufficient to interfere with its effective action.

The siphon would work without the air-pipe' c. This, however, essentially increases the certainty of the operation. In practice the size of the air-pipe is so regulated that during the full working ofthe siphon it will not admit suf- 9o ficient air to prevent its practical operation.

The essential elements of the apparatus are the air-pump, the sealing of both ends of the siphon, and the air-pipe o, so arrang'ed as-to maintain a communication betweenv the air of 95 the tank and that of the siphon until the water in the reservoir reaches a certain height, when it is sealed and the airway is closed. Another characteristic feature of the apparatus is that the force of the feeding stream of 10o water is used to work the air-pump,whi1e the water itself, after performing this duty, `goes to fill the tank for the next discharge. The removal of air from the siphon may be effected by any forln of air-pump driven by such a stream as can be adrnitted to such a tank. Of known ai r-pumps, however, the one shown offers thesiniplestnleans of reaching the end in view.

Myinvention may be described as an autolnaticinterniittent siphon worked by the Withdrawal of its contained air by an exhaust operated by the feeding stream, the same being used for the periodic flushing of sewers and drains.

Having thus described my invention, I claim as new and desire to secure by Letters Patent* l. The combination, with a siphon used to discharge a flush-tank, of an air-pump or aspirator operated by the feeding streannits exhaust opening into the interior of the siphon.

2. In combination with a siphon, the airpnmp b and the pipe c, so arranged as to maintain communication between the siphon and the enter air until one end of the sameis closed by the rising of the water-level, as and for the purpose described.

3. The combinatiomwith the top ofa siphon, of a pipe the end of which is provided with a T-connection, an inlet-pipe, the end of which is within said T-connection, the orifice of said inlet-pipe being smaller than the diameter of the lower part of the T-connectien, and a trap at the bottom of the siphon, as shown and described.

Berlin, January 21, 1887.

FRIEDRIOH CUNTZ.

Witnesses:

B. ROI. M. W. Moonn. 

